A digital network set-top box with a metal-free fastener

Abstract

The present application discloses a digital network set-top box without metal fasteners, relating to the technical field of set-top boxes, which includes a housing, a cover body and a circuit board; an installation space is provided inside the housing; the cover body is detachably connected to the housing, and the cover body can cover the opening of the installation space; the housing has a plurality of support platforms at the bottom of the installation space, and when the circuit board is in contact with and abuts against the support platforms, the circuit board is located in the installation space; the housing has a plurality of positioning members, and a plurality of positioning grooves are correspondingly formed at the edge of the circuit board; a plurality of elastic plug-in members extend outward from the cover body, and a plurality of plug-in slots are correspondingly formed on the housing; one end of the plug-in member away from the cover body has a clamping portion, and a clamping groove is formed on the housing at one side of the plug-in slot. The connection of the present application is stable and can effectively ensure the structural stability of the set-top box. At the same time, it is convenient to disassemble and assemble and is convenient for subsequent maintenance.

Description

Technical Field

[0001] This application relates to the technical field of set-top boxes, and particularly to a digital network set-top box without metal fasteners. Background Art

[0002] At present, with the rapid development of Internet technology, digital network set-top boxes have become an indispensable part of modern families. Such devices are not only used to receive satellite TV signals but also support various online video services, greatly enriching people's audio-visual experience.

[0003] However, in traditional set-top box designs, in order to ensure a firm connection between the housing and internal components, several common solutions on the market include, but are not limited to: 1. The screw fixation method, which involves presetting holes in different parts of the set-top box and then tightening with screws. This method is simple and reliable, but it increases the assembly difficulty and cost, and also makes later maintenance more difficult. 2. Adhesive fixation, which can achieve a seamless connection and has an aesthetic appearance, but the glue is prone to aging and falling off in high-temperature or humid environments, also affecting product quality.

[0004] Although the above two solutions have their unique advantages, they also have obvious limitations. Therefore, there is an urgent need for a digital network set-top box with a firm connection and convenient disassembly and assembly. Summary of the Invention

[0005] This application provides a digital network set-top box without metal fasteners, which has a firm connection and can effectively ensure the structural stability of the set-top box. At the same time, it is convenient to disassemble and assemble and is easy for subsequent maintenance.

[0006] This application provides a digital network set-top box without metal fasteners, adopting the following technical solutions:

[0007] A digital network set-top box without metal fasteners includes a housing, a cover, and a circuit board;

[0008] The interior of the housing has an installation space for installing the circuit board, and the installation space penetrates through the top of the housing to form an opening; the cover is detachably connected to the housing, and the cover can cover the opening of the installation space;

[0009] The housing has a plurality of support platforms at the bottom of the installation space for supporting the circuit board. When the circuit board contacts and abuts against the support platforms, the circuit board is located in the installation space;

[0010] The housing has a plurality of positioning members at the edge of the installation space. A plurality of positioning grooves for the positioning members to snap into are correspondingly formed at the edge of the circuit board, and the plurality of positioning members can simultaneously snap into the plurality of positioning grooves;

[0011] A plurality of elastic plug-in members extend outward from the cover body, and a plurality of plug-in slots for inserting the plug-in members are correspondingly formed on the housing; one end of the plug-in member away from the cover body has a clamping portion, and the housing is provided with a clamping slot for the clamping portion to be clamped on one side of the plug-in slot.

[0012] By adopting the above technical solution, the screwless design can effectively improve the aesthetics of the set-top box, facilitate the disassembly and assembly of the set-top box while improving its durability, and can also simplify the production and maintenance processes of the set-top box, thereby reducing the overall cost and enhancing the user experience; in addition, it can effectively improve the position stability of the circuit board in the installation space, thereby effectively ensuring the structural stability of the set-top box.

[0013] Optionally, the positioning member has elasticity, and the positioning member is in interference fit with the positioning slot.

[0014] By adopting the above technical solution, the positioning effect of the circuit board after installation in the installation space can be improved, and at the same time, the probability of damage to the circuit board or the positioning member caused by friction between the positioning member and the positioning slot can be effectively reduced.

[0015] Optionally, a plurality of expansion members are provided on the cover body, and the plurality of expansion members correspond to the plurality of positioning members one by one;

[0016] The positioning member is provided with an expansion slot for the expansion member to insert. After the cover body is connected to the housing, the expansion member is inserted into the corresponding expansion slot, and both sides of the expansion member close to the expansion slot expand outward.

[0017] By adopting the above technical solution, the connection stability between the cover body and the housing can be effectively improved, and at the same time, the position stability of the circuit board in the installation space can be further improved.

[0018] Optionally, a limiting member is provided on the positioning member;

[0019] The limiting member is rotatably connected to the positioning member, and the rotation axis of the limiting member is perpendicular to the direction in which the expansion member is inserted into the expansion slot; the limiting member is provided with a cooperation slot for the positioning member to pass through, and the positioning member is in interference fit with the cooperation slot;

[0020] When the limiting member rotates towards the direction close to the expansion slot to the limit position, the limiting member can contact and abut against the top of the circuit board.

[0021] By adopting the above technical solution, the limiting member can effectively limit the up and down movement of the circuit board in the installation space, thereby further effectively improving the position stability of the circuit board in the installation space.

[0022] Optionally, a first elastic member is connected between the limiting member and the positioning member, and the first elastic member has a tendency to drive the limiting member to rotate towards the direction close to the expansion groove to the limit position.

[0023] By adopting the above technical solution, the limiting effect of the limiting member on the circuit board can be effectively improved, and thus the position stability of the circuit board in the installation space can be further effectively improved.

[0024] Optionally, after the limiting member rotates away from the expansion groove until the positioning member leaves the fitting groove, the limiting member can keep in contact with and abut against the positioning member under the action of the first elastic member.

[0025] By adopting the above technical solution, the position stability of the limiting member after releasing the limiting effect on the circuit board can be improved, so that it is convenient for the user to disassemble, replace and repair the circuit board, making the use of the limiting member more convenient and fast.

[0026] Optionally, the insertion slot is located inside the peripheral structure of the housing, one end of the clamping slot communicates with the bottom of the insertion slot, and the other end of the clamping slot penetrates through the peripheral surface of the housing to form an opening.

[0027] By adopting the above technical solution, while facilitating the user to release the connection relationship between the cover body and the housing, the appearance beauty of the set-top box can be effectively ensured, and at the same time, the probability of the cover body and the housing being accidentally separated due to external force on the set-top box can be effectively reduced.

[0028] Optionally, a plurality of sliders are further arranged on the housing, and the plurality of sliders correspond to the plurality of clamping slots one by one;

[0029] The slider is located in the clamping slot and can slide along the clamping slot; when the slider slides to the limit position away from the installation space, the clamping portion can be clamped into the clamping slot; when the slider slides to the limit position close to the installation space, the slider can drive the clamping portion to leave the clamping slot.

[0030] By adopting the above technical solution, it can be further convenient for the user to release the connection relationship between the cover body and the housing, and at the same time, the aesthetic degree of the appearance of the set-top box can be further improved.

[0031] Optionally, a plurality of second elastic members are connected between the slider and the housing, and the second elastic members have a tendency to drive the slider to slide to the limit position away from the installation space.

[0032] By adopting the above technical solution, it is possible to further effectively ensure the aesthetic degree of the set-top box appearance, and at the same time, it is convenient for the housing to maintain the state of being installed and connected to the cover body.

[0033] Optionally, one side of the slider close to the installation space has a contact surface for contacting the clamping portion. The contact surface is an inclined surface, and the end of the contact surface close to the installation space is the inclined lower end.

[0034] By adopting the above technical solution, after the slider drives the clamping portion out of the clamping groove, the contact surface can apply an upward acting force to the clamping portion, so as to facilitate the insertion portion to leave the insertion groove, and further facilitate the separation of the cover body from the housing.

[0035] In summary, the present application includes at least one of the following beneficial effects:

[0036] 1. The set-top box is convenient to disassemble and assemble, which is convenient for subsequent maintenance;

[0037] 2. The connections between the structures of the set-top box are firm, so as to effectively ensure the structural stability of the set-top box;

[0038] 3. It can effectively improve the position stability of the circuit board in the installation space, so that the set-top box can maintain stable use;

[0039] 4. While ensuring the aesthetic degree of the set-top box appearance, it is effectively convenient for the user to remove and separate the cover body from the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a metal-free fastener digital network set-top box according to an embodiment of the present application;

[0041] Figure 2 is an exploded view of a metal-free fastener digital network set-top box according to an embodiment of the present application;

[0042] Figure 3 is Figure 2 an enlarged view of part A in

[0043] Figure 4 is a schematic internal structure diagram of a metal-free fastener digital network set-top box according to an embodiment of the present application;

[0044] Figure 5 is a schematic partial internal structure diagram of a metal-free fastener digital network set-top box according to an embodiment of the present application.

[0045] Description of reference numerals: 1. Housing; 11. Installation space; 12. Support platform; 13. Positioning member; 131. Expansion groove; 14. Limiting member; 141. Fitting groove; 15. Insertion groove; 16. Clamping groove; 2. Cover body; 21. Expansion member; 22. Insertion member; 23. Clamping portion; 3. Circuit board; 31. Positioning groove; 4. First elastic member; 5. Slide block; 51. Contact surface; 6. Second elastic member. Detailed implementation manners

[0046] The following Figures 1-5 further describes the present application in detail.

[0047] The embodiment of the present application discloses a digital network set-top box without metal fasteners, which can effectively facilitate the user to disassemble and assemble the set-top box while ensuring the appearance beauty of the set-top box, and can effectively ensure the structural stability during the use of the set-top box.

[0048] Referring to Figure 1 and Figure 2 , the set-top box includes a housing 1, a cover body 2 and a circuit board 3. Among them, after the housing 1 and the cover body 2 are installed and connected, they can effectively protect the circuit board 3 stably; the circuit board 3 is used to implement the digital network related functions of the set-top box.

[0049] The housing 1 is integrally in a cuboid structure. The interior of the housing 1 has an installation space 11 for installing and placing the circuit board 3, and the installation space 11 penetrates through one side in the height direction of the housing 1 to form an opening for facilitating the installation of the circuit board 3 in the installation space 11.

[0050] The circuit board 3 is integrally in a rectangular plate-like structure. After it is installed in the installation space 11, the length direction of the circuit board 3 is parallel to the length direction of the housing 1, and the width direction of the circuit board 3 is parallel to the width direction of the housing 1. In this embodiment, it is preferably that the circuit board 3 is centered in the installation space 11 after installation.

[0051] The housing 1 has a plurality of support platforms 12 at the bottom of the installation space 11 for supporting the circuit board 3. After the circuit board 3 is installed in the installation space 11, the bottom of the circuit board 3 will be in contact with and against a plurality of support platforms 12 at the same time. In this embodiment, it is preferably that the housing 1 has a total of four support platforms 12, which are distributed in pairs at both ends along the length direction of the installation space 11 and are symmetrically distributed.

[0052] Referring to Figure 2 and Figure 3The housing 1 has a plurality of elastic positioning members 13 at the edge of the installation space 11, and a plurality of positioning grooves 31 adapted to the positioning members 13 are correspondingly provided at the edge of the circuit board 3; when the circuit board 3 is installed in the installation space 11, the plurality of positioning members 13 are respectively engaged with the plurality of positioning grooves 31 on the circuit board 3 in an interference fit manner. In this embodiment, preferably, the housing 1 has a total of four positioning members 13, and preferably, the four positioning members 13 are respectively located above the four support platforms 12; correspondingly, preferably, the circuit board 3 has a total of four positioning grooves 31.

[0053] The limiting member 14 is rotatably mounted on the positioning member 13, and the rotation axis of the limiting member 14 is parallel to the width direction of the housing 1; the limiting member 14 is provided with a matching groove 141 for the top of the positioning member 13 to be inserted into, and during the rotation of the limiting member 14 relative to the positioning member 13, the matching groove 141 can be engaged with the top of the corresponding positioning member 13 and can also be released from the engagement with the top of the corresponding positioning member 13. In this embodiment, the top of the positioning member 13 is preferably engaged with the matching groove 141 by interference fit.

[0054] The limiting member 14 is limited in its rotation relative to the positioning member 13 . When the limit member 14 rotates to the extreme position in the direction close to the center of the installation space 11, the matching groove 141 on the limit member 14 can be interference fit with the top of the corresponding positioning member 13. At this time, the friction between the limit member 14 and the corresponding positioning member 13 can keep the limit member 14 fixed relative to the corresponding positioning member 13. At this time, if the circuit board 3 is installed in the installation space 11, the end of the limit member 14 away from its own rotation axis will contact and abut against the top of the circuit board 3. After the circuit board 3 is subjected to the force of the limit member 14, the limit member 14 will limit the displacement of the circuit board 3 along the height direction of the shell 1; when the limit member 14 rotates to the extreme position in the direction away from the center of the installation space 11, the matching groove 141 on the limit member 14 will release the interference fit with the top of the corresponding positioning member 13, and the limit member 14 as a whole will be located on the side of the corresponding positioning member 13 away from the center of the installation space 11, so that the circuit board 3 can be positioned and installed in the installation space 11 through four positioning members 13.

[0055] Reference Figure 4 and Figure 5 Furthermore, in order to improve the limiting effect of the limiting member 14 on the circuit board 3 installed in the installation space 11, a first elastic member 4 is preferably installed between the limiting member 14 and the positioning member 13.

[0056] Reference Figure 3 and Figure 5, the first elastic member 4 is installed at the rotational connection position between the limiting member 14 and the positioning member 13. Its two ends are respectively fixedly connected to the limiting member 14 and the positioning member 13, and it has a tendency to drive the limiting member 14 to rotate towards the center of the installation space 11 to the extreme position. In this embodiment, preferably, the first elastic member 4 is a torsion spring; since the torsion spring is a common prior art, it will not be elaborated here, and only the installation position of the first elastic member 4 is shown in the drawings.

[0057] When the limiting member 14 rotates to the state where it disengages from the top of the corresponding positioning member 13, at this time, the limiting member 14 will maintain the state of being in contact with and against the corresponding positioning member 13 under the action of the first elastic member 4, that is, the limiting member 14 is at the critical point where it engages with the top of the corresponding positioning member 13, and at this time, the limiting member 14 can maintain its current position state under the action of the first elastic member 4.

[0058] Refer to Figure 1 and Figure 2 , the cover body 2 is in an overall rectangular plate-like structure, and the size of the cover body 2 is adapted to the size of the housing 1; the cover body 2 is detachably connected to the housing 1, and when the cover body 2 is connected to the housing 1, the cover body 2 can cover the opening of the installation space 11.

[0059] Refer to Figure 2 and Figure 3 , on one side of the cover body 2 in the thickness direction, four expansion members 21 extend outward along its thickness direction, and the four expansion members 21 correspond to the four positioning members 13 one by one; the positioning member 13 is provided with an expansion slot 131 for the expansion member 21 to insert. After the expansion member 21 is inserted into the expansion slot 131, it has an interference fit with the expansion slot 131 and can expand the parts of the positioning member 13 on both sides of the expansion slot 131; when the positioning member 13 is engaged with the positioning slot 31 on the circuit board 3, at this time, the positioning member 13 can be further expanded to improve the stability of the engagement between the positioning member 13 and the positioning slot 31 on the circuit board 3. In this embodiment, preferably, the expansion slot 131 is located on the side of the positioning member 13 close to the center of the installation space 11, and preferably, the expansion slot 131 penetrates through the side of the positioning member 13 close to the center of the installation space 11 to form an opening and penetrates through both ends of the positioning member 13 in the vertical direction to form openings.

[0060] When the limiting member 14 limits the circuit board 3, after the cover body 2 is connected to the housing 1 and the expansion member 21 is inserted into the corresponding expansion slot 131, the interference fit between the corresponding positioning member 13 and the fitting slot 141 on the corresponding limiting member 14 can be strengthened, thereby further improving the position stability of the limiting member 14 relative to the positioning member 13 at this time. At the same time, the interference fit between the corresponding positioning member 13 and the positioning slot 31 on the circuit board 3 can be strengthened, thereby further improving the position stability of the circuit board 3 in the installation space 11, and further improving the position stability of the circuit board 3 in the installation space 11.

[0061] Refer to Figure 2 and Figure 5 Furthermore, to improve the connection stability after the detachable connection between the cover body 2 and the housing 1, it is preferred that a plurality of plug-in members 22 extend outward along the thickness direction of the edge position of the cover body 2, and a clamping portion 23 is provided on one side of the end of the plug-in member 22 facing away from the center position of the cover body 2. In this embodiment, it is preferred that the cover body 2 has a total of two plug-in members 22, and the two plug-in members 22 are respectively located at both ends of the cover body 2 in the length direction; and it is preferred that the plug-in member 22 has a certain elastic deformation ability and can be bent and deformed to a certain extent.

[0062] Corresponding to the housing 1, two plug-in slots 15 for inserting the plug-in members 22 and two clamping slots 16 for the clamping portions 23 to be clamped into to form a clamping connection are provided. The two plug-in slots 15 are respectively located at both ends of the housing 1 in the length direction, the plug-in slots 15 are opened along the height direction of the housing 1, and an opening is formed at the top of the housing 1; the two clamping slots 16 are respectively located at both ends of the housing 1 in the length direction, and are located on the side of the adjacent plug-in slot 15 facing away from the installation space 11; the clamping slots 16 are opened along the length direction of the housing 1, one end of the clamping slot 16 communicates with the bottom of the adjacent plug-in slot 15, and the other end of the clamping slot 16 penetrates through one side of the housing 1 in the length direction to form an opening.

[0063] When the end of the connector 22 enters the corresponding insertion slot 15, the corresponding clamping portion 23 contacts and abuts against the side wall of the insertion slot 15 away from the installation space 11, which can drive the end of the connector 22 to bend and deform towards the center of the cover 2, facilitating the subsequent insertion of the connector 22 into the insertion slot 15. When the connector 22 is inserted into the insertion slot 15 so that the cover 2 is in full contact and abuts against the housing 1, the corresponding clamping portion 23 can enter the corresponding clamping slot 16 at this time, causing the elastic deformation of the connector 22 to recover, so that the connector 22 contacts and abuts against the side wall of the insertion slot 15 away from the installation space 11, and at this time, the clamping portion 23 in the clamping slot 16 can limit the separation of the cover 2 from the housing 1. In this embodiment, preferably, both ends of the clamping portion 23 along the extending direction of the corresponding connector 22 have a wedge-shaped structure, which is convenient for the end of the connector 22 to enter the corresponding insertion slot 15, and at the same time, it is convenient to control the movement of the cover 2 to make the connector 22 leave the corresponding insertion slot 15 after the clamping portion 23 leaves the clamping slot 16.

[0064] Further, after the cover 2 is connected to the housing 1, in order to facilitate the user to drive the clamping portion 23 away from the corresponding clamping slot 16, thereby facilitating the user to control the connector 22 to leave the corresponding insertion slot 15 to complete the disassembly of the cover 2, preferably, two sliders 5 are also correspondingly installed on the housing 1.

[0065] The two sliders 5 correspond to the two clamping slots 16 one by one, and the slider 5 is installed in the corresponding clamping slot 16; the slider 5 can slide relative to the housing 1 along the opening direction of the clamping slot 16 in the clamping slot 16, and there are limitations during the sliding of the slider 5 relative to the housing 1; when the slider 5 slides to the extreme position in the direction away from the installation space 11, at this time, the surface of the slider 5 facing away from the installation space 11 is flush with the outer surface of the housing 1, and at this time, the space of the clamping slot 16 on the side of the slider 5 close to the installation space 11 can meet the clamping requirements of the clamping portion 23; when the slider 5 slides to the extreme position in the direction close to the installation space 11, at this time, the slider 5 can contact and abut against the clamping portion 23 stuck in the clamping slot 16 and drive the clamping portion 23 away from the clamping slot 16, facilitating the user to control the movement of the cover 2 to make the connector 22 leave the insertion slot 15.

[0066] Furthermore, in order to make the set-top box as flat as possible during use and at the same time make the clamping slot 16 be able to maintain a state where it can be clamped by the clamping portion 23 as much as possible, preferably, a plurality of second elastic members 6 are also installed between the slider 5 and the housing 1.

[0067] Both ends of the second elastic member 6 are fixedly connected to the slider 5 and the housing 1 respectively, and have a tendency to drive the slider 5 to slide to the extreme position in the direction away from the installation space 11. In this embodiment, preferably, the second elastic member 6 is a compression spring, and preferably, a plurality of second elastic members 6 are respectively distributed above and below the corresponding slider 5.

[0068] Furthermore, to facilitate the user to control the slider 5 to slide and drive the engaging portion 23 away from the engaging groove 16, and then control the plug-in member 22 to leave the plug-in groove 15 to realize the separation of the cover body 2 and the housing 1, preferably, one side of the slider 5 close to the installation space 11 has a contact surface 51 for contacting the engaging portion 23 and capable of helping the plug-in member 22 to leave the plug-in groove 15.

[0069] The contact surface 51 is an inclined surface with respect to the sliding direction of the slider 5, and the end of the contact surface 51 close to the installation space 11 is the lower inclined end. At this time, when the slider 5 slides in the direction close to the installation space 11 until the contact surface 51 contacts and abuts against the engaging portion 23, the slider 5 continues to slide and will apply a force to the engaging portion 23 through the contact surface 51 to drive the engaging portion 23 away from the engaging groove 16 and release the engaging fit with the engaging groove 16; after the engaging portion 23 leaves the engaging groove 16, the slider 5 continues to slide and can apply a force to the engaging portion 23 through the inclined design of the contact surface 51 to drive the engaging member away from the engaging groove 16.

[0070] The implementation principle of a digital network set-top box without metal fasteners in the embodiment of the present application is as follows:

[0071] When installing the set-top box, first rotate a plurality of limit members 14 in the direction away from the center of the installation space 11, so that the engaging grooves 141 of the limit members 14 are disengaged from the tops of the corresponding positioning members 13, then respectively engage and position the circuit board 3 with a plurality of positioning members 13 through its own plurality of positioning grooves 31, and then rotate a plurality of limit members 14 in the direction close to the center of the installation space 11, so that the limit members 14 contact the circuit board 3 to limit the circuit board 3; then install the cover body 2 on the housing 1, so that a plurality of expansion members 21 are respectively inserted into a plurality of expansion grooves 131, strengthening the positioning effect of the positioning members 13 on the circuit board 3 and improving the stability of the limiting effect of the limit members 14 on the circuit board 3; at the same time, the plug-in member 22 will be inserted into the plug-in groove 15 so that the engaging portion 23 is snapped into the engaging groove 16 to complete the installation of the set-top box;

[0072] When it is necessary to remove the cover body 2 from the housing 1, simultaneously control the slider 5 to slide in the direction close to the installation space 11, and the engaging portion 23 can be driven away from the engaging groove 16 first, and then the plug-in member 22 can be driven away from the plug-in groove 15 to release the connection relationship between the cover body 2 and the housing 1.

[0073] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A digital network set-top box without metal fasteners, characterized in that: Comprising a housing (1), a cover (2) and a circuit board (3); The housing (1) has an installation space (11) inside for installing the circuit board (3), and the installation space (11) penetrates the top of the housing (1) to form an opening; the cover (2) is detachably connected to the housing (1), and the cover (2) is capable of covering the opening of the installation space (11); The housing (1) has a plurality of support platforms (12) at the bottom of the installation space (11) for supporting the circuit board (3); when the circuit board (3) contacts and abuts against the support platforms (12), the circuit board (3) is located in the installation space (11); The housing (1) has a plurality of positioning members (13) at the edge of the installation space (11); the edge of the circuit board (3) is correspondingly provided with a plurality of positioning grooves (31) for the positioning members (13) to be inserted into; and a plurality of the positioning members (13) can be inserted into a plurality of the positioning grooves (31) at the same time; A plurality of elastic plug-in components (22) are extended outward from the cover body (2), and a plurality of corresponding plug-in slots (15) are provided on the shell (1) for the plug-in components (22) to be inserted into; an end of the plug-in component (22) away from the cover body (2) has a snap-in portion (23), and a snap-in slot (16) is provided on one side of the plug-in slot (15) for the snap-in portion (23) to be snapped into; The positioning member (13) is elastic, and the positioning member (13) and the positioning groove (31) are interference fit; A plurality of expansion members (21) are provided on the cover body (2), and the plurality of expansion members (21) correspond one-to-one to the plurality of positioning members (13); The positioning member (13) is provided with an expansion groove (131) for inserting the expansion member (21); after the cover body (2) is connected to the shell body (1), the expansion member (21) is inserted into the corresponding expansion groove (131), and both sides of the expansion member (21) close to the expansion groove (131) expand outwards; A limiting member (14) is provided on the positioning member (13); The limiting member (14) is rotatably connected to the positioning member (13), and the rotation axis of the limiting member (14) is perpendicular to the direction in which the expansion member (21) is inserted into the expansion groove (131); the limiting member (14) is provided with a matching groove (141) for the positioning member (13) to pass through, and the positioning member (13) and the matching groove (141) are interference-fitted; When the limiting member (14) is rotated to an extreme position in a direction close to the expansion slot (131), the limiting member (14) can contact and abut against the top of the circuit board (3).

2. A digital network set-top box without metal fasteners according to claim 1, characterized in that: A first elastic member (4) is connected between the limiting member (14) and the positioning member (13), and the first elastic member (4) has a tendency to drive the limiting member (14) to rotate in a direction close to the expansion slot (131) to an extreme position.

3. A digital network set-top box without metal fasteners according to claim 2, characterized in that: After the limiting member (14) rotates in a direction away from the expansion slot (131) until the positioning member (13) leaves the matching slot (141), the limiting member (14) can maintain contact and abutment with the positioning member (13) under the action of the first elastic member (4).

4. A digital network set-top box without metal fasteners according to claim 1, characterized in that: The plug-in slot (15) is located inside the peripheral structure of the shell (1), one end of the clamping slot (16) is in communication with the bottom of the plug-in slot (15), and the other end of the clamping slot (16) penetrates the peripheral surface of the shell (1) to form an opening.

5. A digital network set-top box without metal fasteners according to claim 4, characterized in that: The housing (1) is further provided with a plurality of slide blocks (5), and the plurality of slide blocks (5) correspond one-to-one to the plurality of clamping grooves (16); The slider (5) is located in the clamping groove (16) and is capable of sliding along the clamping groove (16); when the slider (5) slides to an extreme position in a direction away from the installation space (11), the clamping portion (23) is capable of being clamped into the clamping groove (16); when the slider (5) slides to an extreme position in a direction close to the installation space (11), the slider (5) is capable of driving the clamping portion (23) to leave the clamping groove (16).

6. A digital network set-top box without metal fasteners according to claim 5, characterized in that: A plurality of second elastic members (6) are connected between the slider (5) and the housing (1), and the second elastic members (6) have a tendency to drive the slider (5) to slide to an extreme position in a direction away from the installation space (11).

7. A digital network set-top box without metal fasteners according to claim 5, characterized in that: The sliding block (5) has a contact surface (51) on one side close to the installation space (11) for contacting the clamping portion (23); the contact surface (51) is an inclined surface, and one end of the contact surface (51) close to the installation space (11) is an inclined lower end.

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